four-wire voice frequency telephone repeater的意思|示意
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四线声频电话中继器
four-wire voice frequency telephone repeater的网络常见释义
四线制话频电话中继器 ... four-wheel motor vehicle 四轮机动车辆 four-wire voice frequency telephone repeater 四线制话频电话中继器 fourier's integral 傅里叶积分 ...